Zoro Goon was going to join regardless, and never made it as a goon in the manga. Where as Vivis character changed into a princess after she was already introduced.
Never heard about Jinbei was supposed to be an arc boss though, do you have any quote to share on that?
I've been spending the last few hours trying to find the interview where I read about Jinbe being an arc boss but I can't for the life of me find it. I'll just have to concede that point.
And nah, it's not the whole "A previous boss will join" thing. I recall it standing out to me because I sincerely didn't believe that Jinbe was ever intended to be an enemy and it took me by surprise because it implied that he may not have been planned as a nakama. But seeing as how I can't find the interview, it's moot.